Red was used extensively in medieval manuscripts for headings, running titles and initials. In the case of f67r2, I would see the red text as a heading for the text in the circle segments below. However, there are no repetitions of the titles in the text in the circle segments (which would have been conceivable, at least similar words).
edit: but there seems to be patterns in the titles. Here is an example:
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edit: but there seems to be patterns in the titles. Here is an example:
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